Skate bearing bushing for 5mm square bar

Ever wanted to fit a skate bearing on a square shaft? I did so I made a bushing to make them fit. It works with NanoBeam.

https://www.kickstarter.com/projects/bossgizmo/nanobeam-helping-makers-build-the-smallest-things

Files are provided in SolidWorks, OpenSCAD and STL.